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WO1998008233A1 - Poudre magnetique et article magnetique moule - Google Patents

Poudre magnetique et article magnetique moule Download PDF

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Publication number
WO1998008233A1
WO1998008233A1 PCT/JP1997/002908 JP9702908W WO9808233A1 WO 1998008233 A1 WO1998008233 A1 WO 1998008233A1 JP 9702908 W JP9702908 W JP 9702908W WO 9808233 A1 WO9808233 A1 WO 9808233A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnetic particles
resin
particles
group
Prior art date
Application number
PCT/JP1997/002908
Other languages
English (en)
Japanese (ja)
Inventor
Hitoshi Ohtaki
Original Assignee
Tdk Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tdk Corporation filed Critical Tdk Corporation
Priority to EP97936852A priority Critical patent/EP0921534A4/fr
Priority to US09/147,704 priority patent/US6063303A/en
Publication of WO1998008233A1 publication Critical patent/WO1998008233A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent

Definitions

  • the present invention relates to a magnetic powder and a magnetic molded product using the same.
  • a resin-containing magnetic material that has electromagnetic characteristics by dispersing magnetic powder in resin as a mold core material has been known for some time.
  • the magnetic particles that make up the magnetic powder were generally spherical, taking into account the fluidity during injection molding.
  • the resin-containing magnetic material described above has superior dimensional accuracy compared to oxide magnetic material as a sintered body obtained by molding and firing, and has a high degree of freedom in shape because it does not go through the firing process. There are excellent features.
  • the resin-containing magnetic material obtained by the conventional technology had low electromagnetic characteristics when formed into a magnetic molded product.
  • JP-A-6-163236 discloses a ferrite resin having good injection moldability and high magnetic permeability by selecting the particle size distribution and content of the ferrite powder in ferrite resin. However, only a magnetic permeability of about 22 was obtained as the initial magnetic permeability of the magnetic molded product.
  • JP-A-2-185540, JP-A-2-226799, JP-A-96202, JP-A-4-12029, JP-B-3-52422, JP-A-6-84648 Prior arts disclosed in gazettes and the like are known, but due to the small particle size of the mixed oxide magnetic material and the small amount of mixing, etc., sufficient initial magnetic permeability can be obtained when formed into a magnetic molded product Absent.
  • An object of the present invention is to provide a magnetic powder capable of improving the electromagnetic characteristics by increasing the filling amount of magnetic particles in a magnetic molded product, and a magnetic molded product using the same.
  • the magnetic powder according to the present invention is composed of a set of resin-coated magnetic particles.
  • the resin-coated magnetic particles include non-spherical magnetic particles, and the magnetic particles are coated with a resin.
  • non-spherical broadly includes a scaly shape, a flat shape, a spherical shape or a shape in which a part of a spherical or oval shape is missing, and a shape having an uneven surface.
  • the weight (filling amount) of the magnetic powder with respect to the entire volume must be increased as much as possible.
  • the initial magnetic permeability of a magnetic molded product is only about 35 at the maximum, and it is difficult to secure a higher initial magnetic permeability.
  • the reason is that, in the past, almost spherical magnetic particles were used, so when a magnetic molded product was used, the spherical magnetic particles came into point contact with each other on the spherical surface, resulting in a large gap between the magnetic particles. This is presumed to be due to a limitation in increasing the filling amount of the magnetic particles.
  • the present inventor has conducted intensive studies to solve the above-mentioned conventional problems. As a result of using the non-spherical magnetic particles, when forming a magnetic molded product, the gap between the magnetic particles was reduced, It has been found that the filling amount of iron can be increased, thereby improving the electromagnetic characteristics.
  • non-spherical magnetic particles have a larger surface area per particle than a particle having a shape close to a sphere, so that the adsorptive force with the resin is increased, so that the bonding between the magnetic particles and the resin is increased. Effects such as an increase in strength can also be expected.
  • the magnetic particles are composed of a plurality of types having different particle sizes, and the plurality of types of magnetic particles are commonly coated with a resin.
  • the others may be spherical or non-spherical. In other words, a combination of only spherical magnetic particles is excluded.
  • the particle size of a magnetic particle can be defined by the maximum particle size.
  • magnetic particles having a large particle diameter are made non-spherical.
  • the gaps between the magnetic particles having a large particle diameter are filled with spherical or non-spherical magnetic particles having a small particle diameter. And further improved electromagnetic characteristics can be secured.
  • the periphery of the magnetic particles is filled with non-spherical magnetic particles having a small particle diameter.
  • the weight of the magnetic particles with respect to the volume can be further increased, and further improved electromagnetic characteristics can be secured.
  • the decrease in the electromagnetic characteristics is due to the resin existing between the magnetic particles becoming magnetic resistance. Therefore, it is desirable that the magnetic particles have as large a particle size as possible. According to the preferred embodiment described above, when a magnetic molded product is formed, the gaps between the magnetic particles having a large particle size are filled with the magnetic particles having a small particle size. Resistance can be reduced. For this reason, the electromagnetic characteristics can be further improved.
  • the magnetic powder of the present invention it is possible to obtain a magnetic molded product in which the initial magnetic permeability, which was conventionally only 30 units, is improved to 40 or more.
  • the resin-coated magnetic particles contained in the magnetic powder according to the present invention are particles in which the magnetic particles are covered with a resin, the fluidity is improved, and injection molding can be performed.
  • a gas phase method is used as a gas phase method
  • various synthetic methods in a solvent are used as a liquid phase method
  • a meso-chemical method is used while mixing and stirring a mixture with a resin in a solid phase method.
  • Various methods are conceivable, such as a method of forming a resin layer by a mechanical action, and a method of attaching a part of the resin by collision with the resin.
  • the resin used in the present invention may be either a thermosetting resin or a thermoplastic resin as long as it does not cause stress in the magnetic powder due to expansion due to softening and curing.
  • the magnetic powder according to the present invention does not regulate various surface treatments on the magnetic powder that are generally performed or addition of various additives used for improving various characteristics.
  • the magnetic powder according to the present invention is used for molding a magnetic molded product. Examples of the magnetic molding include a core of a choke coil, an inductor, a rotary transformer, or an EMI element.
  • the magnetic powder according to the present invention has a resin coating film formed on the surface of the non-spherical magnetic particles, it is filled in a mold, heated and pressed to melt the resin. Curing is caused, and a magnetic molding having a large amount of magnetic particles can be obtained. In molding, the coated resin is softened or filled into a mold that can be heated to the softening start temperature, and heated and pressed to mold.
  • the resin may be taken out without heating at the time of pressure molding, and then heated in an oven to cure the resin.
  • the magnetic molded product using the magnetic powder according to the present invention it is possible to realize an electromagnetic characteristic value, particularly an initial magnetic permeability of 40 or more.
  • This characteristic is the minimum required for parts such as ceramic cores, inelles, EMI, etc., which were conventionally supported by sintered cores. Therefore, when compared with a sintered core, the magnetic powder according to the present invention can be used as a high-precision material for various types of cores having the same characteristics but excellent dimensional accuracy.
  • the magnetic molded product according to the present invention may be used alone, or may be used in combination with a molded product made of a sintered magnetic material, an oxide magnetic material, a metal magnetic material, a non-magnetic material, or the like. .
  • FIG. 1 is an enlarged sectional view of the resin-coated magnetic particles contained in the magnetic powder according to the present invention
  • FIG. 2 is an enlarged sectional view showing another example of the resin-coated magnetic particles contained in the magnetic powder according to the present invention. It is.
  • the resin-coated magnetic particles include non-spherical magnetic particles A, Particles A are thinly coated with resin C.
  • the magnetic powder according to the present invention is a collection of the magnetic particles A shown in FIG.
  • the non-spherical magnetic particles A can be obtained, for example, as crushed pieces of ferrite.
  • the maximum value of the particle diameter D1 of the magnetic particles A is determined according to the thickness of the magnetic molded product. For example, if the minimum thickness of the magnetic molded product is 5000, the particle size D1 of the magnetic particles A must be within 5000 m at the maximum.
  • the non-spherical magnetic particles A have a larger surface area per particle than a nearly spherical particle, the adsorptive power to the resin C increases and the strength increases. And other effects can also be expected.
  • the resin-coated magnetic particles are composed of first magnetic particles A having a particle diameter D1 and second magnetic particles B having a particle diameter D2.
  • the second magnetic particles B are commonly coated with the resin C.
  • the first magnetic particles ⁇ having a particle size D1 and the second magnetic particles B having a particle size D2 are both non-spherical.
  • the particle diameter D2 of the second magnetic particles B is significantly smaller than the particle diameter D1 of the first magnetic particles A.
  • the particle diameters Dl and D2 of the first magnetic particles A and the second magnetic particles B are defined as the maximum diameters of the particles. It is desirable that the particle diameter D1 of the first magnetic particles A be 5000 ⁇ m at the maximum and 355 ⁇ m at the minimum.
  • the particle diameter D2 of the second magnetic particles B is desirably less than 355 m when the particle diameter D1 of the first magnetic particles A is selected as described above.
  • the gap between the first magnetic particles A having a large particle diameter D1 is filled with the second magnetic particles B having a small particle diameter D2.
  • the amount of resin C to be used can be reduced, and its magnetic resistance can be reduced. others Therefore, the electromagnetic characteristics can be further improved.
  • the magnetic powder of the present invention it is possible to obtain a magnetic molded product whose initial magnetic permeability has been improved to 40 or more, which has been conventionally obtained only in 30 units.
  • both the first magnetic particles A and the second magnetic particles B are non-spherical, but it is sufficient that at least one of the first magnetic particles A and the magnetic particles B is non-spherical. That is, the first magnetic particles A may be spherical, the second magnetic particles B may be non-spherical, the first magnetic particles A may be non-spherical, and the second magnetic particles B may be spherical.
  • the resin-coated magnetic particles shown in FIG. 1 and the magnetic particles shown in FIG. 2 coexist.
  • the numbers of the first magnetic particles A and the second magnetic particles B included in the resin-coated magnetic particles of FIG. 2 are not necessarily limited to the illustrated numbers.
  • the initial permeability of the magnetic molded product is determined in relation to the initial permeability of the magnetic particles A and B.
  • magnetic particles A and B having an initial magnetic permeability of 200 or more are used.
  • the magnetic particles according to the present invention may be either an oxide magnetic material or a metal magnetic material.
  • a typical example of the oxide magnetic material is a light, such as a Mn-based soft light, a Mg-based soft light, and a Ni-based soft light.
  • These magnetic materials can include various additives.
  • the resin-coated magnetic particles may be constituted by using the oxide magnetic material and the metal magnetic material alone, or a plurality of selected from the above-described magnetic materials may be contained in one resin-coated magnetic particle. Magnetic particles made of a magnetic material may be included.
  • the resin-coated magnetic particles may be constituted by using Mn-based soft guide, Mg-based soft guide, Ni-based soft guide or the like alone, or the above-mentioned resin may be contained in one resin-covered magnetic particle. Magnetic particles made of a plurality of magnetic materials selected from X-light materials may be included.
  • the magnetic powder according to the present invention contains resin-coated magnetic particles composed of the above-mentioned various magnetic materials alone or magnetic particles of a plurality of magnetic materials selected from the above-described magnetic materials. Containing either or both of the resin-coated magnetic particles Good.
  • the powder obtained by pulverizing the powder is 1000 ⁇ m or more and less than 1000 ⁇ m 425; m or more, less than 425 ⁇ m 300 ⁇ m or more, 300 ⁇ m Classified into 6 particle size distributions of less than 125 ⁇ m or more and less than 125 ⁇ m.
  • the powdered powders of each particle size distribution obtained by classification those belonging to the particle size distribution of 355 / zm or more are classified as the first magnetic particles A, and the powders belonging to the particle size distribution of less than 355 m
  • the powder is defined as a group of second magnetic particles B.
  • the maximum particle size of the magnetic particles included in the first group of magnetic particles A is about 5000 m.
  • the first group of magnetic particles A and the second group of magnetic particles B are both non-spherical (indefinite) because they use ferrite powder obtained by grinding.
  • a group of the first magnetic particles A of which 50% by weight or more has a particle size distribution of 425 m or more and less than 1000 ⁇ m
  • This mixed fiber powder was put into a grind mill, and a styrene acryl resin powder was added thereto, followed by stirring for about 3 minutes.
  • a magnetic powder in which the mixed fly powder was coated with a styrene acryl resin was obtained.
  • the mixing ratio between the mixed fine powder and the styrene acrylic resin was 10: 1 by weight.
  • a magnetic powder containing the resin-coated magnetic particles shown in FIG. 2 was obtained.
  • the obtained magnetic powder was placed in a mold and heated to 140 ° C. while applying a pressure of 1 (tZcm 2 ) to produce a toroidal core, and its electromagnetic characteristics were measured.
  • the volume V (cc) of the toroidal core is the total volume of the group of the first magnetic particles A, the group of the second magnetic particles B, and the styrene acryl resin, and the weight W (g) of the filled filler. Is the weight of the mixture of the first magnetic particle A group and the second magnetic particle B group.
  • Thermosetting powdery resin (epoxy resin) Product name Araldite AT-1 made by Ciba-Geigi As shown in Table 1, in sample No. 12 (comparative example) in which resin was coated on spherical magnetic particles of Mn-based soft powder, However, the volume weight index is as low as 3.15, sufficient magnetic particles cannot be packed, and the initial permeability is as low as 35. On the other hand, sample No. ll, in which non-spherical magnetic particles made of crushed Mn-based soft ferrite were coated with resin, had a volume weight index as high as 3.31 and an initial magnetic permeability of 40. However, it shows a significant effect of improving the electromagnetic characteristics with respect to Sample No. 12.
  • the electromagnetic characteristics and moldability when formed into a magnetic molded product are determined by using a plurality of types of magnetic particles having different particle size distributions and particle sizes to be included in the resin-coated magnetic particles.
  • the mixing ratio of the magnetic particles, the mixing ratio of the magnetic particles and the resin, the initial magnetic permeability of the magnetic particles, and the like in this case it can be controlled to a preferable value. An example will be described below with reference to an experimental example.
  • the first group of magnetic particles A and the second group of magnetic particles B obtained through the same classification process as in Experimental Example 1 were mixed with the mixture ratio (weight ratio) within the particle size distribution shown in Experimental Example 1. Change While mixing.
  • Each of the group of the first magnetic particles A and the group of the second magnetic particles B is a crushed piece of Mn-based soft ferrite and is non-spherical.
  • This mixed ferrite powder was put into a grind mill, and styrene acryl resin powder was added thereto, followed by stirring for about 3 minutes. As a result, a magnetic powder was obtained in which styrene acryl resin was coated on the mixed fly powder.
  • the mixing ratio between the mixed fine powder and the styrene acryl resin was 10: 1 by weight.
  • Table 2 shows the particle size distribution, mix ratio moldability, electromagnetic characteristics, and volume index of the core samples Nos. 21 to 28 obtained in this way.
  • the first group of magnetic particles A has a particle size distribution in which 50% by weight or more has a particle size distribution of 425 / m or more and less than 1000; um, and the second group of magnetic particles B has a size of 50% by weight or more.
  • Table 2 it can be found that the optimum mixing ratio of the mixed ferrite powder and the resin is in a range where the volume weight index is 3.3 or more.
  • Experimental Example 3 Mixing ratio of first magnetic particle A group and second magnetic particle B group According to the same method as in Experimental example 1, first magnetic particle A group and second magnetic particle B A group was obtained. 97% by weight of the first group of magnetic particles A was prepared such that the particle size distribution was 425 // m or more and less than 1000 ⁇ m, and the average particle size was about 600 / m. Also, 97% by weight of the group of the second magnetic particles B was prepared so that the particle size distribution was 125 zm or more and less than 300 im, and the average particle size was about 180 m. The group of the first magnetic particles A and the group of the second magnetic particles B were mixed, a toroidal core was made in the same manner as in Experimental Example 1, and the electromagnetic characteristics were measured.o
  • Table 3 shows the particle size distribution, mixing ratio, resin content ratio, moldability, initial permeability, and the like of the first magnetic particle A group and the second magnetic particle B group for the obtained sample Nos. 31 to 39. Indicates the volume weight index.
  • a first group of magnetic particles A and a second group of magnetic particles B were obtained. 97% by weight of the first group of magnetic particles A was prepared so that the particle size distribution was 425 ⁇ m or more and less than 1000 / m, and the average particle size was about 600 60011). In the first group of magnetic particles A, 1.5% by weight has a particle size distribution of 1000 m or more, and the remaining 1.5% by weight has a particle size distribution force of less than 425 ⁇ m.
  • 97% by weight of the group of the second magnetic particles B was prepared so that the particle size distribution was 125 m or more and less than 300 m, and the average particle size was about 180 m.
  • 1.5% by weight has a particle size distribution of 300 to 425 m, and the remaining 1.5% by weight has a particle size distribution of less than 125 / m.
  • a styrene acryl resin coating was performed in the same manner as in Experimental Example 1.
  • the styrene acrylate resin was heated so that the resin content ratio (weight ratio) to the second powder A and the second powder B was different.
  • Table 4 shows the particle size distribution, mixing ratio, resin content, moldability, initial permeability, and the particle size distribution of the first magnetic particle A group and the second magnetic particle B group for the obtained sample Nos. 41 to 48.
  • the volume weight index is shown.
  • the resin content ratio of the first powder A and the second powder B is shown as ferrite: resin.
  • the resin content ratio (ferrite: resin) of the styrene acrylic resin to the group of the first magnetic particles A and the group of the second magnetic particles B is preferably in the range shown in Sample Nos. 43 to 48.
  • the particle size distribution and the mixing ratio were set to the same conditions as in Experimental Example 1, and a thermosetting resin and a thermoplastic resin were used as the coating resin.
  • the change in characteristics caused by the difference in resin used was examined.
  • the molding temperature when the thermosetting resin was used was the curing temperature of the resin. Table 5 shows the results.
  • Thermosetting powdery resin (epoxy resin): Trade name Araldite AT-1
  • thermosetting resin As shown in Table 5, even when a thermosetting resin is used, the same moldability and electromagnetic characteristics as those obtained when a thermoplastic resin is used can be ensured.
  • the 97% by weight of the second group of magnetic particles A was prepared so that the particle size distribution was 425 m or more and less than 1000 m, and the average particle size was about 600 m.
  • First group of magnetic particles A 1.5% by weight has a particle size distribution of 1000 m or more, and the remaining 1.5% by weight has a size distribution of less than 425 nm.
  • Table 6 shows the relationship between the initial magnetic permeability /// i of the magnetic particles and the initial magnetic permeability of the magnetic molded product for the samples 61 to 64 obtained by changing the initial magnetic permeability ⁇ i.
  • a magnetic powder capable of improving the electromagnetic characteristics by increasing the filling amount of magnetic particles in a magnetic molded product and a magnetic molded product using the same. it can.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention porte sur une poudre magnétique contenant des particules magnétiques enrobées de résine. Lesdites particules consistent en des particules non sphériques A et B enrobées d'une résine C. Les particules magnétiques ainsi enrobées accroissent les caractéristiques magnétiques au delà de ce qui est obtenu en intégrant des particules A et B lors de la production par moulage de poudre magnétique d'un article magnétique moulé dont les caractéristiques électromagnétiques se trouvent améliorées.
PCT/JP1997/002908 1996-08-21 1997-08-21 Poudre magnetique et article magnetique moule WO1998008233A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97936852A EP0921534A4 (fr) 1996-08-21 1997-08-21 Poudre magnetique et article magnetique moule
US09/147,704 US6063303A (en) 1996-08-21 1997-08-21 Magnetic powder and magnetic molded article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP21976596 1996-08-21
JP8/219765 1996-08-21

Publications (1)

Publication Number Publication Date
WO1998008233A1 true WO1998008233A1 (fr) 1998-02-26

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US (1) US6063303A (fr)
EP (1) EP0921534A4 (fr)
WO (1) WO1998008233A1 (fr)

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